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Freezing Point Depression

Q. An aqueous solution has a boiling point of 101.27oC. Determine the freezing point of this solution (the molal boiling point constant for water is 0.52oC kg/mole while the molal freezing point constant is 1.86oC kg/mole)

Solved • May 6, 2020

Mole Fraction

Q. A solution of isopropyl alcohol, C3H7OH, in water has a mole fraction of alcohol equal to 0.38. What is the weight per cent alcohol and the molality of the solution?

Solved • May 6, 2020

Weak Acid Strong Base Titrations

Q. Calculate the pH of a solution that results from the mixing of 25.00 ml of 0.028 M benzoic acid with 15.00 ml of 0.025 M NaOH ( the Ka for benzoic acid is 6.3 x 10-5)

Solved • May 6, 2020

Ksp

Q. Determine the pH needed to prevent precipitation in a 0.002 M solution of CoCl2 if the Ksp of Co(OH)2 is 9.2 x 10-15

Solved • May 6, 2020

Ksp

Q. Determine the molar solubility of Fe(OH)3 if its Ksp is 3.2 x 10-39 at a given temperature

Solved • May 6, 2020

Ksp

Q. What is the mass (in g) of silver nitrate (AgNO3) that can dissolve in 1.00 L of 0.10 M Na2CrO4solution? The solubility product for Ag2CrO4: Ksp = 1.2 X 10-12

Solved • May 6, 2020

Integrated Rate Law

Q. In the first order decomposition of N2H4 at 740 K, it is found that 18% of a sample has decomposed in 16.9 minutes. How long will it take for 50.0% of the sample to decompose?

Solved • May 6, 2020